Dial adjuster



Dec. 11,1923. 1,477,185

1 c. PFANSTIEHL DIAL ADJUS TER Filed July 23, 1923 Patented Dec. 11, 1923.

' UNITED STATES PATENT oFFlcE.;

CARL PFANSTIEHL, OF HIGHLAND PARK, ILLINOIS, ASSIGNOR T PFANSTIEHL RDIOv SERVICE C0., A. CORPORATION OF ILLINOIS.

DIAL ADJUSTER.

Application led July 23, 1923. Serial No. 653,171.

. To all 'whom t may conce/ra.'

Be it-known that I, CARL PFANs'rIEHL, a citizen of the Unitedl States, residing at Highland Park, in the county of Lake and o State of Illinois, have invented new and useful Improvements in Dial Adjusters, of which the following is a specification. y

' This invention relates to devices for adjusting dials and the like andl is particularly adapted to be used for adjusting the dials of condensers7 vario coupler and variometers of radio receiving apparatus.

It is fully described in the following spec-- iiication and shown in the accompanying drawings in which: j

Figure 1 is a front elevation of a dial with a' dial adjuster thereon in normal inoperable position;

Fig. 2 is a similar view with the dial removed; and

Fig. 3 is a vertical section on the line 3 of Fig. 1.

The device as here illustrated is shown in connection with a condenser having a shaft which is journaled.in the end plate 11 ofthe condenser which is secured to the panel 12 by means of screws (not shown). An ordinary dial 13 is secured on the outer end of the shaft 10 by `means of a screw 14.

so This dial is held a iiXed distancel from the panel 12 by means of an insulated bushing 15.

The adjuster is placed between the dial 13 and the panel 12 and comprises a ilat its upper end on a shouldered bolt 17 which is secured to the panel 12. The lever 16 has a slot 18 which is slidable over the bolt 17. A large opening 19 is located near the center of the lever and loosely surrounds the bushing 15. Spacing fingers 20 of wire are secured to the lever 16 at 21, the upper ends pressing against the bushing 15. Owing tothe angle which the upper end of the lingers are bent pressure is exerted upon the bushing 15 which normally tends to hold the lever 16 both in the central and raised posi tion as shown with the bottoni of the opening 19 pressing against the bottom of the insulated bushing 15.

rlhe upper end of the lever 16 is bent outwardly and downwardly and holds a small block 22 of rubber, fabric or the like. An 'operating knob 23 is secured to the lower end of the lever.

lever 16 which is pivotally mounted near Y drawing the lever 16 down'againstthe action of the spring fingers 20, until the blockr 22 is in engagement -with the dial 13. Any movement now of the knob to the rightl or left will cause the lever4 16 to swing about the pin 17 as a pivot. Owing tothe fact that the distancefrom the knob 23 to the pinl 17 isy many times asgreat as the dis-` tance of the pin `17 tothe rubber block 22 which is in contact with the edge of the dial, a relatively large movement of the knob 23 to the right or left will cause the dial to be moved a relatively small amount.

It will be understood that this device is applicable to nearly all the devices now on the market employing dials and that by its use any dial may be given a micrometer I or Vernier adjustment.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the prior art.

I claim: V

1. An adjuster for dials comprising a lever adapted to lie between the dial and panel and having two portions extending from beneath said dial, means attached to one of said portions for makin@ contact with said dial, means normally holding said contact means out of contact with the edgel of the dialJ and a pivot near the contact means about which the lever moves.

2. An adjuster for dials comprising a lever adapted to lie between the dial and ypanel and having two portions extending from beneath opposite sides of said dial, means attached to one of said portions for making contact with said dial, means normally holding said contact means out of contact with the edge of the dial, and a pivot near the contact means about which the lever moves.

3. An adjuster 'for d'luls nonnmisug "a lever adapted to Alie 'between 'the dial and panel and having two portions extending from beneath .op d osite .sides yofiseid dial,` e ril'bber n'feliiler a tahd to one o said portions for making contactw'it'h said dil, two convergingsprings pressing upon the ldie] sha-ft to center the lever and hold said rubi s ber member out of Contact with the dial, and

niallly holding ssiid imem'ber out of contactv withlthe edge oli Ithe dial7 'and u fulcrum adnpted fto 'be secured neer seidv member about "which "the lever swings.

"5. An Ladjuster for dials comprising L lever ndepted Eto klie between ythe dial and carrying a.. .member ladapted to .contact the edge of snidditl when seid member is moved Aredielly 'towr'd said dial, means nor- :mally :holding said member out of Contact with the edge of the dial, und a fulcrum adapted to be: :secured near said member about which the lever swings, said lever having an opening through lwhich the shzvft` orf the' `died projects.

l6. An adjuster for dials comprising :1

lever adapted 'to ylie between the. dial `and panel and having one portion extending beyond Sthe dial 'by which fthe lever maybe moved, another portion of Iseid lever adepted `to mztler driving Contact with the -dial when the last-named portion `is 'moved in oneldireotion byfthe first mentionedportion. seid dial being then rotatablellby motion of the lever in n, plane `parallel to `the dial.

@ARL rFANsTiEHL. 

